| 摘要 |
A collective retrieval function of a DMC (or DMP) device requests a DMS device having a "sufficient search capability" to conduct retrieval using a retrieval function provided in the DMS device, whereas the DMC (or DMP) conducts retrieval from a DMS device not having the "sufficient search capability" by using "retrieval-by-index" in place of retrieval performed by the DMS device. Thus, because requests for retrieval and retrieval-by-index are actively switched according to whether the DMS device to be subjected to the collective retrieval has the "sufficient search capability", it is possible to conduct collective retrieval irrespective of whether the DMS device has the "sufficient retrieval capability".
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